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    Partnering multifocal IOLs with LASIK to achieve perfect vision

    Eradicating residual ammetropia with the bioptics combination

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    Michael C. Knorz, MD
    Today many cataract and refractive lens exchange (RLE) patients desire, and sometimes even demand, perfect vision postoperatively. I find the best way to ensure this is to offer pseudophakic surgery as part of a "bioptics combination package" with wavefront-guided LASIK.

    Offering this bioptics package can be beneficial because lens power calculation will not achieve emmetropia in all patients. In addition, any residual ammetropia will require patients to use glasses, which counteracts the planned benefits of potential spectacle independence with multifocal intraocular lenses (IOLs).

    The combination approach in practice

    Data from 22 eyes of 19 of my recent patients (average age: 54 years), show that multifocal IOLs can be successfully combined with wavefront-driven ablations to achieve excellent visual results that satisfy the very high expectations of modern cataract patients.

    Three-month follow-up data on these patients (nine with an Intralase flap preoperatively) with multifocal IOL implants (Tecnis; AMO, ReZoom; AMO & ReStor; Alcon) and subsequent wavefront-guided CustomVue LASIK (AMO) for fine-tuning showed tremendous improvement in vision and full spectacle independence.


    Figure 1: Multifocal bioptics refraction.
    The preoperative sphere and cylinder before the IOL implantation were significantly reduced postoperatively. The average spherical error dropped from 3.71 D to 0.85 D after implanting the IOL, dropping even further to just 0.12 D after customized LASIK. Similarly, the average cylindrical error dropped from 2.04 D to 1.04 D after IOL implantation and to 0.23 D after LASIK (Figure 1).

    The customized LASIK did not significantly change higher-order aberrations, such as coma, trefoil and spherical aberrations. For example, coma changed from 0.11 to 0.14 RMS, trefoil remained unchanged at 0.15 RMS and spherical aberration was slightly reduced from 0.11 to 0.09 RMS (Figure 2). We observed no surgical complications and none of the patients lost two or more lines of spectacle-corrected visual acuity (VA).

    Importance of patient selection

    Patient selection is very important when using multifocal IOLs. These IOLs are designed to provide spectacle independence but have some side effects, including halos and glare at night. Therefore, they are indicated only in patients who do not want to use glasses. Ideal candidates are presbyopic hyperopes and presbyopic high myopes. Traditionally speaking, the poor candidates are likely to be low myopes.

    A recent case of a 56-year old male patient illustrates our bioptics results. Preoperatively, refraction in the left eye was +5.50 D sphere. After cataract extraction, I implanted a Tecnis multifocal IOL. Postoperatively 1.50 D of residual hyperopia remained and his uncorrected visual acuity (UCVA) was only 20/40. Following wavefront-guided LASIK with the VISX CustomVue system, his refraction was +0.50 -0.25x10, with UCVA exactly as I wanted it at 20/20 and N1 (better than J1).

    This patient's wavefront data show that his residual sphere was corrected and coma, one of the higher-order aberrations, was also significantly reduced. There was also a significant improvement in the point-spread function (both for all aberrations and for only higher-order aberrations) from preoperatively to postoperatively.

    How do we time the procedures?

    At our clinic, the bioptics combination package for cataract surgery includes the lens exchange surgery, with or without cataract, and customized LASIK, Epi-LASIK or another method of corneal refractive surgery for fine-tuning.

    123

    Michael C. Knorz, MD
    Professor Michael Knorz is the founder and medical director of the FreeVis LASIK Center at the University Medical Center in Mannheim, ...

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